6F2D:
reference: Structure of the core of the type III secretion system export apparatus., Kuhlen L, Abrusci P, Johnson S, Gault J, Deme J, Caesar J, Dietsche T, Mebrhatu MT, Ganief T, Macek B, Wagner S, Robinson CV, Lea SM, Nat Struct Mol Biol. 2018 Jul;25(7):583-590. doi: 10.1038/s41594-018-0086-9. Epub, 2018 Jul 2. PMID: 29967543

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